<!-- 多选框的默认选中 -->

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>checkbox多选框</title>
</head>
<body>
    选项列表：
    <input type="checkbox">选项1
    <input type="checkbox">选项2
    <input type="checkbox">选项3
    <input type="checkbox" checked>选项4
</body>
</html>